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Neutral wire issues

02-22-2009, 09:57 PM

I have an issue where Im hooking up a computer automation and it requires 110v service, when I hook up the unit in question it feeds back on the nuetral wire 110v causing the GFCI to trip could this be a problem with the transformer?

Comment

I have an issue where Im hooking up a computer automation and it requires 110v service, when I hook up the unit in question it feeds back on the nuetral wire 110v causing the GFCI to trip could this be a problem with the transformer?

Motor loads are known to trip GFCI's, combined with slight neutral current harmonics due to electronics, yeah, it could trip GFCI's. Usually motor loads are not GFCI protected for that reason. Usually they are on deticated lines with single recepacles

Comment

If I am correct in understanding this,what I think you may have is a broken neutral of a three wire feeder. Find the one breaker that does shutoff the power to the problem outlet. With a faulty neutral one should still be able to meter voltage from hot to ground. I am trying to understand what you mean by the power dropping off. If you are comfortable with basic electrical work and being in a live panel (or are ok with killing the main for a bit) then the purchase of a toner could prove invaluable for locating the feeder in the panel and isolating the problem.